Abstarct: According the increasing demand for energy, and increasing environmental pollution in the world, proper air conditioning is essential. One of the concerns of the 21st century is the limited amount of fossil fuel resources. In addition, the problems caused by these fuels in terms of environmental pollution. The need to find solutions to manage the consumption of these resources is doubled. One of the most important ways to optimize energy consumption, with of the increasing energy efficiency, the use of combined heat and power generation systems, heat and cold. This research was conducted at Shahrood University of Technology. The purpose of this research is to design and model a system for producing electricity, heat and cold simultaneously with an energy storage system for building the university. By designing a storage system, in addition to improving system performance, store energy surplus and use stored energy when needed. In this research, EES and Aspen B-JAC software has been used to model and design various system equipment. The storage capacity of the tank was carried out in 3 different ways, including design with overall load, partial load and design with increasing chiller capacity. An organic rankine cycle was proposed and performance modeling was performed. Finally, the entire system was analyzed in four different sections from the economic point of view, and the system was investigated in terms of pay back (PB), Internal Rate of Return (IRR) and net present value of income (NPV). The results show that the design of the reserve system with partial load, it has less storage capacity and also requires a smaller cooling chiller to 200 tons of refrigeration and this system is better in designing a system than two other systems. Due to the heat load required for the building, which was powered by two heat exchangers from the waste energy generated from the jacket and the combustion gases of the engine and its amount is 1490 kW, the electric power is 1253 kW and the cooling capacity of the absorption chiller is 250 tons. The efficiency of the combined cooling, heat and power system was estimated at 85%, and the efficiency of the organic rankine cycle with R141B refrigerant was ultimately 24%. The system is divided into 4 sections, which include combined cooling, heat and power system with general storage and organic rankine cycle, partial storage, no storage system with the same clock function and evaluated with a reasonable hourly performance per year. The system was calculated for 20 years and the results show with cold water storage systems compared to triple time production systems with the same operating hours, the time to return the capital is greater, and triple production systems without a storage system have a better economic justification. In the next section, with a reasonable clock for the training system, it was determined that the combined cooling, heat and power system with a partial storage has a better economic justification than other systems, even the creation of a combined cooling, heat and power system without a storage system.